Tomographic imaging of a conical fluidized bed of dry pharmaceutical granule

Wiens, Jason; Pugsley, Todd

doi:10.1016/j.powtec.2006.07.022

Cited by 26 publications

(19 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…C x is the 2-D concentration's average value along the y direction. To obtain the lateral diffusion coefficient, D sr is first assumed to be a small value, and then it is put into Eq.uation (5), from which C x is calculated and compared with the data by the image analysis. Then, D sr is incremented by a small step value, and the calculation is repeated.…”

Section: Dispersion Coefficientsmentioning

confidence: 99%

“…On the other hand, the artificially uneven distribution of fluidized air can also result in a local internal circulating flow [3,4], which might improve the lateral dispersion. The fluidized velocity changes in the fuel heating zone can affect the volatile release rate, the combustion rate, and the heat transfer rate between the high-temperature bed materials and fuel particles [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The circulation was controlled by producing an imbalance in the air supplies to different zones of the distributor, tilting the distributor (so that the flow is up the slope), or the use of a spout as a pump. The three methods mentioned above have been employed as the main ways to induce an internal circulating flow in fluidized beds [3][4][5][6][7][10][11][12][13][14][15][16]. Thus, this fluidized bed is called an ICFB.…”

Section: Introductionmentioning

confidence: 99%

“…The image technique has also recently been widely applied to achieve comprehensive two-dimensional visualization in fluidized beds in recent years [5,14,15,27,[31][32][33]. Through visualization experiments, Bin et al [14] confirmed that there is a transverse movement of bubbles from the high-velocity side to the low-velocity side in internally circulating fluidized beds.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dispersion characteristics of dissimilar materials in a fluidized bed with unevenly distributed fluidizing air

et al. 2017

View full text Add to dashboard Cite

Section: Dispersion Coefficientsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dispersion characteristics of dissimilar materials in a fluidized bed with unevenly distributed fluidizing air

et al. 2017

View full text Add to dashboard Cite

“…After this period, data shows that as the granule dried the centralized gas flow breaks apart and particle mixing improve this likely associate with higher rate of drying. The behavior of particle inside the conical FB are studied by (Wiens and Pugsley, 2006), where the dense particle region are gathered near the wall of the FB with decreasing solid concentration toward the center. For high moisture content there is a presence of centralized core bubble in the bed and more uniform fluidization through the bed cross section towards the end of the drying process (Chaplin et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Conical Fluidized Bed with Arc Design for Improved Performance of Gas Distributor

Hamawand

Silva

Jawad

2015

SET

View full text Add to dashboard Cite

Particles distributions along a conical fluidized bed were predicted by an alternative arrangement of the minimum fluidization velocity equation. The proposed approach introduces two new equations which present the particle diameter in the bed as function of: height in the bed (Z), angle of inclination of the fluidized bed wall (θ), input flow rate (Q o ), and gas distributor diameter (D o , 2r o ). A novel arc-shaped design of the gas distributor was suggested, which provides enhanced distribution of the gas and enables greater control on the direction of the gas inlet. The model showed that the inclination of the fluidized bed wall should not exceed a critical angle, which can be determined with the set of equations specially developed for this purpose, to prevent inhomogeneous fluidization across the bed and accumulation of particles along the walls.By applying the Box Wilson Method, theoretical data were obtained for constant column diameter at the base (0.05 m), and varying bed height, Z, (range: 0.5 to 1.5 m), velocity of gas inlet, U, (range 0.25 to 1 m s -1 ), and balance factor, a, (range: 0.5 to 1, a new factor), respectively. The angle of inclination of the wall was first predicted based on the above parameters, and subsequently, the particle size distribution along the column was determined. Theoretically the novel arc-shaped distributor design has shown the potential of generating homogeneous fluidization regimes along the bed.

show abstract

Radioactive particle tracking in a lab‐scale conical fluidized bed dryer containing pharmaceutical granule

et al. 2008

Self Cite

View full text Add to dashboard Cite

Radioactive particle tracking (RPT) has been used to study the motion of the particulate phase in a bench-scale conical fluidized bed containing dried pharmaceutical granule. RPT revealed that there is a distinct circulation pattern of the granule with particles moving upwards at high velocities near the centre of the bed and falling slowly near the walls. There was also a localized region near the centre of the bed where particles moved downward rapidly. The particle size distribution (PSD) of the granule had an appreciable impact on particle motion with a wide PSD leading to larger fluctuations in particle velocity as well as poorer granule mixing.On a eu recours au suivi de particules radioactives (RPT) pourétudier le déplacement de la phase particulaire dans un lit fluidisé coniqueà l'échelle de laboratoire garni de granules pharmaceutiques séchés. La technique RPT révèle l'existence d'un profil de circulation distinct de celui des granules, les particules se déplaçant vers le hautà des vitessesélevées près du centre du lit et retombant lentement près des parois. Il existé egalement une région localisée près du centre du lit où les particules se déplacent vers le bas rapidement. La distribution de tailles des particules (PSD) des granules a un impact appréciable sur le déplacement des particules, une large PSD menantà de plus grandes fluctuations de vitesse des particules età un plus faible mélange des granules.

show abstract

Tomographic imaging of a conical fluidized bed of dry pharmaceutical granule

Cited by 26 publications

References 23 publications

Dispersion characteristics of dissimilar materials in a fluidized bed with unevenly distributed fluidizing air

Dispersion characteristics of dissimilar materials in a fluidized bed with unevenly distributed fluidizing air

Conical Fluidized Bed with Arc Design for Improved Performance of Gas Distributor

Radioactive particle tracking in a lab‐scale conical fluidized bed dryer containing pharmaceutical granule

Contact Info

Product

Resources

About